Merge rust-bitcoin/rust-secp256k1#417: Allow SharedSecret to be created from byte array

463148f9a0 bump version to 0.22.1 (Dominik Spicher)
9be8e74107 Allow SharedSecret to be created from byte array (Dominik Spicher)

Pull request description:

  This was accidentally removed in 8b2edad. See also the discussion
  on https://github.com/rust-bitcoin/rust-secp256k1/pull/402

  Closes #416.

ACKs for top commit:
  apoelstra:
    ACK 463148f9a0

Tree-SHA512: 04e16226efa2cf6fd461eabb0c78e5b00f347c78e20c1c7561591ffa74a7259fb3265b49a9d7326caf70e4d5ce32a620485f1bd5538c292654f91eb68c2a57dc

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 0.22.1 - 2022-03-10
+
+* [Reintroduce](https://github.com/rust-bitcoin/rust-secp256k1/pull/417) accidentally removed possibility to create `SharedSecret` from byte serialization
+
 # 0.22.0 - 2022-03-08
 
 * Disable `bitcoin_hashes/std` by default; [add `bitcoin-hashes-std` feature to re-enable it](https://github.com/rust-bitcoin/rust-secp256k1/pull/410)

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "secp256k1"
-version = "0.22.0"
+version = "0.22.1"
 authors = [ "Dawid Ciężarkiewicz <dpc@ucore.info>",
             "Andrew Poelstra <apoelstra@wpsoftware.net>" ]
 license = "CC0-1.0"

src/ecdh.rs

@@ -71,6 +71,11 @@ impl SharedSecret {
     pub fn secret_bytes(&self) -> [u8; SHARED_SECRET_SIZE] {
         self.0
     }
+
+    /// Creates a shared secret from a byte serialization.
+    pub fn from_bytes(bytes: [u8; SHARED_SECRET_SIZE]) -> SharedSecret {
+        SharedSecret(bytes)
+    }
 }
 
 impl Borrow<[u8]> for SharedSecret {